Kissaluv Marvels are one size, fitted diapers. They fit most babies from 10-40lbs. Latex-free elasticized legs and waist for leak proof fit. Simple, snap-on design helps adjust rise easily to fit babies of different sizes. Three body layers and micro fiber soaker provide absorbency even for the heaviest wetters. Super fun, designer print 100% cotton outer and a wonderful bamboo velour inner fabric. As both the inside and outside fabric are absorbent materials, use a diaper cover with this diaper.